The original German title is "Lieder ohne Worte" (https://en.wikipedia.org/wiki/Songs_Without_Words https://en.wikipedia.org/wiki/Songs_Without_Words), and ther

The original German title is "Lieder ohne Worte" (https://en.wikipedia.org/wiki/Songs_Without_Words https://en.wikipedia.org/wiki/Songs_Without_Words), and there is AFAIK no strict requirement for lyrics to count as a "Lied" (or at least "Lied" is not connected to "singen" the way "song" is connected to "sing").